TITLE:
Kinetics and Thermodynamics of Adsorption Methylene Blue onto Tea Waste/CuFe2O4 Composite
AUTHORS:
Saeedeh Hashemian, Majeed Karimi Ardakani, Hamila Salehifar
KEYWORDS:
Adsorption; CuFe2O4 Composite; Kinetic; Methylen Blue (MB); Tea Waste; Thermodynamic
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.7A,
July
2,
2013
ABSTRACT: Tea waste/CuFe2O4 (TW/C) composite was prepared by
co-precipitation method. The TW and TW/C samples are characterized by FTIR,
XRD, SEM and N2 physical adsorption. The results showed that specific
surface area of 350 and 570 m2·g?1 for TW and TW/C, respectively. The average pore size of TW/C is ca. 100 nm. Adsorption of methylen blue onto
TW/C composite has been studied. Measurements are performed at various contact
time, pH and adsorbent dosage.
The adsorption kinetics of methylen blue (MB) could be described by the
pseudo-second order kinetic model. The adsorption isotherms are described by
means of Langmuir and Freundlich isotherms. It was found that the Freundlich
model fit better than the Langmuir model. The thermodynamic constants of the
adsorption were calculated to predict the nature of adsorption. The values of
thermodynamic parameters indicate that a spontaneous and endothermic process
was occurred.